Leonard henkle



(No Model.) Y '2 Sheets-Sheet 1', L. HENKLE.

LAMP. N0. 412,181. Patented Oct. l, 1889.

WITNESS/5S INVENTO/ ATTORNEYS (No Model.) 2 Sheets-Sheet 2. L. HBNKLE.

LAMP. UL-412,181. Patented 001;. 1. 1889.

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ATTORNEYS UNITED STATES PATENT rErcE.

LEONARD I-IENKLE, OF ROCHESTER, ASSIGNOR TO CHARLES STANFORD UPTON, OF NEW YORK, N. Y.

LAMP.

SPECIFICATION forming part of Letters Patent No. 412,181, dated October 1, 1889. Application tiled May 27, 1887. Serial No. 239,565. (No model.)

To @ZZ whom it may concern.-

Be it known that I, LEONARD HENKLE, a citizen of the United States, and a resident of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Lamps, of which the following is a specification.

My invention relates to what are known as Argand or central-draft lamps, which employ cylindrical wicks and inner and outer wick-tubes, and are provided with inside and outside drafts for maintaining constant and even currents of fresh air to both sides of the fiame.

My invention consists in the construction and arrangement of a centrally-located thimble or auxiliary tube arranged over the inner or central draft tube having means for retaining the same in proper position, the thimble being provided with perforations which regulate the currents of air to the inner surface of the fiame, as hereinafter more fully described, and pointed out in the claims.

In order that my invention may be fully understood, I will proceed to describe it with reference to the accompanying drawings, in which- Figure l is a central'vertical section of the central-draft tube of a Rochester lamp, showing my improved thimble 0r auxiliary tube attached by means of a screw-thread. Fig. 2 is a side elevation showing the thimble or auxiliary tube attached by means of a bayonet-joint. Fig. 3 is a detail view,being a vertical section on the line 3 3, Fig. 2, looking in the direction of the arrow. Fig. 4 is a Vertical section on the line e 4, Fig. 5, showing the thimble or auxiliary tube seated within the top of the central-draft tube. Fig. 5 is a top view thereof. Fig. 6 is a vertical section showing the thimble or auxiliary tube attached by means of a screw-thread within the top of the central-draft tube. Fig. 7 is a vertical section showing the thimble or auxiliary tube attached by means of a bayonet-joint within the top of the central-draft tube.

A is the centraldraft tube, YV the wick, and B the outer wick-tube, of a central-draft lamp.

C is my improved thirnble or auxiliary tube, which is formed with perforations, as shown.

In some classes of central-draft lamps I have found it desirable to cover the entire space at the top of the central-draft tube, as it happens at times that eddying currents will form in the chamber between the thimble and the inner walls of the centraldraft tube, Where such an open space or chamber is provided; and to obviate the drawbacks and difficulties obtaining in this respect to certain sizes and designs of lamps I find it necessary to bridge the opening of the inner tube at its upper edge, so as to entirely cover it. I therefore extend the thimble or auxiliary tube C over the entire upper opening of the centraldraft tube A and at the upper edge thereof, as shown.

The perforations above referred to are located in the upper vertical side walls of the thimble or auxiliary tube, and are for the purpose of feeding the fresh incoming air to the inner surface of the fiame. In order, however, to bring about the desired flame effect, it is necessary to stand the perforated portion of the thimble away from the flame; and for this purpose I set it inwardly from the top of the central-draft tube A, so that when the Wick israised it will not be in juxtaposition with the walls of the perforated thimble, and the currents of air will be sufficiently blended before they reach the iame to produce a satisfactorily economical result.

To combine the advantages of the insetting thimble with the central-draft tube, I have found it necessary to provide an outwardlyextending annular flange or shoulder C,Whicl1 extends between the vertical perforated walls of the thimble and the upper edge of the central-draft tube A. This shoulder supports the perforated walis of the thimble, and at the same time closes the central-draft tube at its upper end.' The shoulder C extends inwardly on a line flush with the top of the outer wick-tube B in Figs. 4, 6, and 7, and substantially on a line in Figs. 1,2, and 3,and. the perforated thimble extends vertically upward from the inner edge of said shoulder.

Another drawback my present invention is intended to obviate is the leaking or creepino' over of the oil from the inner surface of the wick down the inside of the central-draft tube. This is what is known in the trade as weeping By providing a rim or collar C2 upon the lower end of the auxiliary tube C and fitting this rim or collar exactly upon the central-draft tube the oil that has a tendency to creep over will be directed back to the wick.

In Fig. 1 I show the rim C2 formed with a screw-thread R on the inside, by which the thimble or auxiliary tube is secured to a screw-thread S on the outside of the centraldraft tube.

In Figs.2 and 3 I show my thimble or auxiliary tube provided with a slot J, engaging a lug L on the central-draft tube, thus forming a bayon et-J oint, thelug L being stamped up or otherwise secured. The outwardly-extending shoulder C will seat upon the upper edge of the central-draft tube A.

Where a short thimble or auxiliary tube is employed, located on the outside of the tube, it is necessary to fasten or lock it positively, as by a screw-thread or bayonet-joint, otherwise the wick when raised would dislodge it from its proper position. In lieu, however, of screwing or joining the thimble or auxiliary tube on the outside of the tube A, the parts may be reversed, and it may be screwed or attached on the inside, as shown in Figs. 4, 5, 6, and 7, where Figs. 4c and 5 show the thimble orauxiliary tube attached by the rim seat-ing on a thread R, in Fig. 6 by a screwthread, and in Fig. 7 by a bayonet-joint.

Where the collar C2 is fitted on the inside 4of the central-draft tube A it is necessary to fit it quite tightly, in order to prevent the leaking or weeping aforesaid.

In every case the means for supporting and retaining the thimble or auxiliary tube in its proper central position is formed in one with the central-draft tube, and the complementary interlocking or fastening device on the thimble is formed integrally with the said thimble, so that the intermediate supporting pins or rods which have been heretofore employed for supporting and centering th e thimble are dispensed with. The perforated thimble C will thus be directly supported and retained in position at its lower end upon the central-draft tube A or a protruding part thereof.

It will be seen that the portion including the top of the thimble or auxiliary tube above the shoulder is of smaller diameter than the central-draft tube, as the shoulder extends inwardly from the upper edge of the latter. The sides of the perforated portion are vertical and the top thereof imperforate. This is the preferred form of my lamp-burner, as it produces in most cases the best results and gives forth when burning an almost white light.

Having thus described my invention, the following is what I claim as new therein and desire to secure by Letters Patent: l. In a central-draft lamp, a thimble or auxiliary tube C, having perforated vertical wallsr formed with a shoulder Cand a rim C2, substantially as shown and described.

2. In a central-draft lamp, the combination,

with a centraldraft tube, of a perforated thimble or auxiliary tube having an outwardly-projecting portion seating upon the top of said draft-tube, the perforated portion of said thimble or auxiliary tube setting inwardly, so as to stand olf from the line of flame.

3. In a central-draft lamp, the combination, with the central-draft tube, of a perforated thimble or auxiliary tube standing inwardly from the line of iiame and setting over the outside of the central-draft tube and being supported thereby, substantially as and for the purposes set forth.

4. In a central-draft lamp, the combination, with a centraldraft tube, of a perforated thimble or auxiliary tube supported by said draft-tubeand extending inwardly from the upper edge of the draft-tube and then vertically upward, as and for the purposes set forth.

5. In a central-draft lamp, the combination, with the central-draft tube, of the perforated thimble or auxiliary tube, the vertical side walls and top of the thimble'or auxiliary tube being of smaller diameter than the drafttube, and the thimble or auxiliary tube at its lower end seating directly on the drafttube and adapted to be retained in a central position thereby.

6. In a central-draft lamp, the combination, with a central-draft tube, of a thimble or auxiliary tube having a perforated portion setting inwardly on a line with the top of the outer wick-tube and then upward to the top of the thimble or auxiliary tube, the upper side walls and top of said thimble or auxiliary tube being of a smaller diameter than the draft-tube.

7. In a central-draft lamp, the combination,

with a central-draft tube, of a thimble or auxiliary tube supported by said draft-tube closing the upper end of the latter at its edge, the vertical side walls of the thimble or auxiliary tube being perforated, and said walls and top of the thimble or auxiliary tube being of a smaller diameter than the centraldraft tube.

8. In a central-draft lamp, the combination, of a central-draft tube forming the inner-wick tube open for the admission of air, a thimble or auxiliary tube the internal diameter of the lower portion of which corresponds with` the external diameter of said draft tube and adapted to set over the upper end of said draft-tube, the said thimble or auxiliary tube being constructed with an upper portion above the draft-tube of a diameter less than the diameter of the draft-tube, so as to form an annular shoulder as a rest upon the upper end of the draft-tube, the sides of the upper portion being perforated, substantially as described.

9. The combination of the central -draft tube A, having a screw-thread or its equivalent, and the perforated thimble or auxiliary IOO IIO

1o perforated Walls for distributing the air, as

described, the. said thimble or auxiliary tube standing inwardly from the line of ame and terminating at its lower end in a rim C2, formed parallel with the central-draft tube,

and adapted to be supported and retained in 15 a central position by said central-draft tube.

LEONARD HENKLE. Witnesses:

R. F. OsGooD, CHARLES S. UPToN. 

